Experimental techniques Flashcards
1
Q
3 methods of collecting gases
A
- Displacement of water
- Downward delivery
- Upward delivery
2
Q
What gases are collected by displacement of water?
A
Common gases
Carbon dioxide, oxygen, hydrogen
3
Q
What gases are collected by downward delivery?
A
Gases heavier than nitrogen
Chlorine, hydrogen chloride, sulfur dioxide
4
Q
What gases are collected by upward delivery?
A
Gases lighter than nitrogen
Ammonia
5
Q
Drying acidic gases
A
Use concentrated sulfuric acid
6
Q
Substances that sublime
A
Iodine, ammonium chloride, dry ice (solid carbon dioxide), napthalene
7
Q
Drying basic gases
A
Use CaO (quicklime) because it is basic in nature
8
Q
Drying neutral gases
A
Use fused calcium chloride
